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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a56681ec4d54879913dcfc451c0fd2ac28e33830452992353cb83ce7a1eb8c' 
  AND token = '4ktwq3FCKZTMcrZsyj3fLRjxTBsVvLI3EPWBmMY4o3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}